#709DDC

CSS

:root {
  --blue-bay: #709ddc;
  --blue-bay-rgb: 112 157 220;
  --blue-bay-oklch: oklch(0.689 0.106 256.9);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(215 61% 65%);
  border-color: oklch(0.689 0.106 256.9);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #709ddc;
  --color-blue-bay-50: #e3f7ff;
  --color-blue-bay-100: #d3eaff;
  --color-blue-bay-200: #b9d6ff;
  --color-blue-bay-300: #97b9ee;
  --color-blue-bay-400: #76a0dc;
  --color-blue-bay-500: #5787cb;
  --color-blue-bay-600: #4a73ab;
  --color-blue-bay-700: #3b5c8a;
  --color-blue-bay-800: #284366;
  --color-blue-bay-900: #1b2f48;
  --color-blue-bay-950: #0b1b2f;
}

SCSS

$blue-bay: #709ddc;
$blue-bay-rgb: 112, 157, 220;
$blue-bay-light: mix(#fff, $blue-bay, 20%);
$blue-bay-dark: mix(#000, $blue-bay, 20%);

.element {
  color: $blue-bay;
  box-shadow: 0 0 0 2px rgba($blue-bay, 0.35);
}